disk file avoid file.Stat()

weed/storage/backend/disk_file.go

@@ -2,6 +2,7 @@ package backend
 
 import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	. "github.com/chrislusf/seaweedfs/weed/storage/types"
 	"os"
 	"time"
 )
@@ -22,11 +23,15 @@ func NewDiskFile(f *os.File) *DiskFile {
 	if err != nil {
 		glog.Fatalf("stat file %s: %v", f.Name(), err)
 	}
+	offset := stat.Size()
+	if offset%NeedlePaddingSize != 0 {
+		offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
+	}
 
 	return &DiskFile{
 		fullFilePath: f.Name(),
 		File:         f,
-		fileSize:     stat.Size(),
+		fileSize:     offset,
 		modTime:      stat.ModTime(),
 	}
 }
@@ -47,6 +52,10 @@ func (df *DiskFile) WriteAt(p []byte, off int64) (n int, err error) {
 	return
 }
 
+func (df *DiskFile) Append(p []byte) (n int, err error) {
+	return df.WriteAt(p, df.fileSize)
+}
+
 func (df *DiskFile) Truncate(off int64) error {
 	err := df.File.Truncate(off)
 	if err == nil {